My progress so far. You'll notice a new top section. I have a little factor which I'm using to convert all of the sand I dug out into glass. No snow will be able to enter the city then(yes!) but I'm going to need a lot of glowstone and candles so that the snow won't cover up the glass.
Only 40 more layers to go! xD
Also, I've been looking at the Aether mod and I'm losing my mind over how cool it looks. If I want to download it, having no other mods installed previously, how do I go about it? I know the minecraft wiki says I need to install three other mods so could anyone go through the process on how to do this?
I don't want to corrupt anything with my existing world and I know I'll mess something up along the way if I try this without knowing how to do everything correctly.